[INFO] fetching crate playbook 0.4.2...
[INFO] building playbook-0.4.2 against master#c7f6aa2869acdbf014d094c6e427e554e160b6db for pr-146237-2
[INFO] extracting crate playbook 0.4.2 into /workspace/builds/worker-1-tc1/source
[INFO] started tweaking crates.io crate playbook 0.4.2
[INFO] finished tweaking crates.io crate playbook 0.4.2
[INFO] tweaked toml for crates.io crate playbook 0.4.2 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate playbook 0.4.2 on toolchain c7f6aa2869acdbf014d094c6e427e554e160b6db
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 141 packages to latest compatible versions
[INFO] [stderr]       Adding clap v2.34.0 (available: v4.5.48)
[INFO] [stderr]       Adding colored v1.9.4 (available: v3.0.0)
[INFO] [stderr]       Adding dirs v1.0.5 (available: v6.0.0)
[INFO] [stderr]       Adding fern v0.5.9 (available: v0.7.1)
[INFO] [stderr]       Adding handlebars v1.1.0 (available: v6.3.2)
[INFO] [stderr]       Adding itertools v0.8.2 (available: v0.14.0)
[INFO] [stderr]       Adding nix v0.11.1 (available: v0.30.1)
[INFO] [stderr]       Adding pyo3 v0.5.4 (available: v0.26.0)
[INFO] [stderr]       Adding uuid v0.7.4 (available: v1.18.1)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2024
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded proc-macro-hack-impl v0.4.3
[INFO] [stderr]   Downloaded spin v0.4.10
[INFO] [stderr]   Downloaded mashup v0.1.14+deprecated
[INFO] [stderr]   Downloaded proc-macro-hack v0.4.3
[INFO] [stderr]   Downloaded rust-argon2 v0.8.3
[INFO] [stderr]   Downloaded colored v1.9.4
[INFO] [stderr]   Downloaded redox_users v0.3.5
[INFO] [stderr]   Downloaded dirs v1.0.5
[INFO] [stderr]   Downloaded handlebars v1.1.0
[INFO] [stderr]   Downloaded blake2b_simd v0.5.11
[INFO] [stderr]   Downloaded uuid v0.7.4
[INFO] [stderr]   Downloaded fern v0.5.9
[INFO] [stderr]   Downloaded nix v0.12.1
[INFO] [stderr]   Downloaded itertools v0.8.2
[INFO] [stderr]   Downloaded mashup-impl v0.1.14+deprecated
[INFO] [stderr]   Downloaded pyo3-derive-backend v0.5.4
[INFO] [stderr]   Downloaded rpds v0.5.0
[INFO] [stderr]   Downloaded pyo3cls v0.5.4
[INFO] [stderr]   Downloaded ymlctx v0.1.8
[INFO] [stderr]   Downloaded impersonate v0.0.3
[INFO] [stderr]   Downloaded pyo3 v0.5.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cbb30128d3180fb5d14fb4fb91f8a2081f9bbf5bd0bbe9745914b4b581f3f95c
[INFO] running `Command { std: "docker" "start" "-a" "cbb30128d3180fb5d14fb4fb91f8a2081f9bbf5bd0bbe9745914b4b581f3f95c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cbb30128d3180fb5d14fb4fb91f8a2081f9bbf5bd0bbe9745914b4b581f3f95c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cbb30128d3180fb5d14fb4fb91f8a2081f9bbf5bd0bbe9745914b4b581f3f95c", kill_on_drop: false }`
[INFO] [stdout] cbb30128d3180fb5d14fb4fb91f8a2081f9bbf5bd0bbe9745914b4b581f3f95c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 048232e64d12e201f319311f69a25e69bb3e713935c605a3c490d10c1e55689b
[INFO] running `Command { std: "docker" "start" "-a" "048232e64d12e201f319311f69a25e69bb3e713935c605a3c490d10c1e55689b", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2024
[INFO] [stderr]    Compiling nix v0.12.1
[INFO] [stderr]    Compiling unicode-width v0.1.14
[INFO] [stderr]    Compiling nix v0.11.1
[INFO] [stderr]    Compiling sha1_smol v1.0.1
[INFO] [stderr]    Compiling impersonate v0.0.3
[INFO] [stderr]    Compiling is-terminal v0.4.16
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling itertools v0.8.2
[INFO] [stderr]    Compiling dirs v1.0.5
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling rpds v0.5.0
[INFO] [stderr]    Compiling serde_json v1.0.145
[INFO] [stderr]    Compiling fern v0.5.9
[INFO] [stderr]    Compiling colored v1.9.4
[INFO] [stderr]    Compiling sha1 v0.6.1
[INFO] [stderr]    Compiling uuid v0.7.4
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling clap v2.34.0
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]    Compiling ymlctx v0.1.8
[INFO] [stderr]    Compiling playbook v0.4.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::path::Path`
[INFO] [stdout]  --> src/lang/python.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::path::Path;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::result::Result`
[INFO] [stdout]  --> src/lang/python.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::result::Result;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Context` and `CtxObj`
[INFO] [stdout]  --> src/lang/python.rs:3:23
[INFO] [stdout]   |
[INFO] [stdout] 3 | use ymlctx::context::{Context, CtxObj};
[INFO] [stdout]   |                       ^^^^^^^  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `TaskErrorSource` and `TaskError`
[INFO] [stdout]  --> src/lang/python.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::{TaskError, TaskErrorSource};
[INFO] [stdout]   |             ^^^^^^^^^  ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Write`
[INFO] [stdout]  --> src/lang/python.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io::Write; // for flushing stdio
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/systems/mod.rs:10:24
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn start<I>(&self, Context, I) -> Result<String, TaskError>
[INFO] [stdout]    |                        ^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: Context`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` (part of `#[warn(rust_2018_compatibility)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/systems/mod.rs:10:33
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn start<I>(&self, Context, I) -> Result<String, TaskError>
[INFO] [stdout]    |                                 ^ help: try naming the parameter or explicitly ignoring it: `_: I`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]    --> src/builtins.rs:277:5
[INFO] [stdout]     |
[INFO] [stdout] 276 |     unimplemented!();
[INFO] [stdout]     |     ---------------- any code following this expression is unreachable
[INFO] [stdout] 277 |     let nproc = pool.len();
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::trim_right`: superseded by `trim_end`
[INFO] [stdout]   --> src/systems/docker.rs:38:33
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let newline_len = id_stdout.trim_right().len();
[INFO] [stdout]    |                                 ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] help: replace the use of the deprecated method
[INFO] [stdout]    |
[INFO] [stdout] 38 -     let newline_len = id_stdout.trim_right().len();
[INFO] [stdout] 38 +     let newline_len = id_stdout.trim_end().len();
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `nproc`
[INFO] [stdout]    --> src/builtins.rs:277:9
[INFO] [stdout]     |
[INFO] [stdout] 277 |     let nproc = pool.len();
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_nproc`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `grid`
[INFO] [stdout]    --> src/builtins.rs:275:14
[INFO] [stdout]     |
[INFO] [stdout] 275 | fn fork_pool(grid: Vec<Context>, pool: &Vec<CtxObj>) -> TransientContext {
[INFO] [stdout]     |              ^^^^ help: if this is intentional, prefix it with an underscore: `_grid`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pool`
[INFO] [stdout]    --> src/builtins.rs:275:34
[INFO] [stdout]     |
[INFO] [stdout] 275 | fn fork_pool(grid: Vec<Context>, pool: &Vec<CtxObj>) -> TransientContext {
[INFO] [stdout]     |                                  ^^^^ help: if this is intentional, prefix it with an underscore: `_pool`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 13.02s
[INFO] running `Command { std: "docker" "inspect" "048232e64d12e201f319311f69a25e69bb3e713935c605a3c490d10c1e55689b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "048232e64d12e201f319311f69a25e69bb3e713935c605a3c490d10c1e55689b", kill_on_drop: false }`
[INFO] [stdout] 048232e64d12e201f319311f69a25e69bb3e713935c605a3c490d10c1e55689b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+c7f6aa2869acdbf014d094c6e427e554e160b6db" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 607a5ed3016ce54f5e08ae1172386649300239a0303f010ef1c4d3f6aa017fe5
[INFO] running `Command { std: "docker" "start" "-a" "607a5ed3016ce54f5e08ae1172386649300239a0303f010ef1c4d3f6aa017fe5", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2024
[INFO] [stderr]    Compiling rustix v1.1.2
[INFO] [stderr]    Compiling once_cell v1.21.3
[INFO] [stderr]    Compiling getrandom v0.3.3
[INFO] [stdout] warning: unused import: `std::path::Path`
[INFO] [stdout]  --> src/lang/python.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::path::Path;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::result::Result`
[INFO] [stdout]  --> src/lang/python.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::result::Result;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Context` and `CtxObj`
[INFO] [stdout]  --> src/lang/python.rs:3:23
[INFO] [stdout]   |
[INFO] [stdout] 3 | use ymlctx::context::{Context, CtxObj};
[INFO] [stdout]   |                       ^^^^^^^  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `TaskErrorSource` and `TaskError`
[INFO] [stdout]  --> src/lang/python.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::{TaskError, TaskErrorSource};
[INFO] [stdout]   |             ^^^^^^^^^  ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Write`
[INFO] [stdout]  --> src/lang/python.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io::Write; // for flushing stdio
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/systems/mod.rs:10:24
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn start<I>(&self, Context, I) -> Result<String, TaskError>
[INFO] [stdout]    |                        ^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: Context`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` (part of `#[warn(rust_2018_compatibility)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/systems/mod.rs:10:33
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn start<I>(&self, Context, I) -> Result<String, TaskError>
[INFO] [stdout]    |                                 ^ help: try naming the parameter or explicitly ignoring it: `_: I`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]    --> src/builtins.rs:277:5
[INFO] [stdout]     |
[INFO] [stdout] 276 |     unimplemented!();
[INFO] [stdout]     |     ---------------- any code following this expression is unreachable
[INFO] [stdout] 277 |     let nproc = pool.len();
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::trim_right`: superseded by `trim_end`
[INFO] [stdout]   --> src/systems/docker.rs:38:33
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let newline_len = id_stdout.trim_right().len();
[INFO] [stdout]    |                                 ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] help: replace the use of the deprecated method
[INFO] [stdout]    |
[INFO] [stdout] 38 -     let newline_len = id_stdout.trim_right().len();
[INFO] [stdout] 38 +     let newline_len = id_stdout.trim_end().len();
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `nproc`
[INFO] [stdout]    --> src/builtins.rs:277:9
[INFO] [stdout]     |
[INFO] [stdout] 277 |     let nproc = pool.len();
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_nproc`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `grid`
[INFO] [stdout]    --> src/builtins.rs:275:14
[INFO] [stdout]     |
[INFO] [stdout] 275 | fn fork_pool(grid: Vec<Context>, pool: &Vec<CtxObj>) -> TransientContext {
[INFO] [stdout]     |              ^^^^ help: if this is intentional, prefix it with an underscore: `_grid`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pool`
[INFO] [stdout]    --> src/builtins.rs:275:34
[INFO] [stdout]     |
[INFO] [stdout] 275 | fn fork_pool(grid: Vec<Context>, pool: &Vec<CtxObj>) -> TransientContext {
[INFO] [stdout]     |                                  ^^^^ help: if this is intentional, prefix it with an underscore: `_pool`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling tempfile v3.23.0
[INFO] [stderr]    Compiling playbook v0.4.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::path::Path`
[INFO] [stdout]  --> src/lang/python.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::path::Path;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::result::Result`
[INFO] [stdout]  --> src/lang/python.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::result::Result;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `Context` and `CtxObj`
[INFO] [stdout]  --> src/lang/python.rs:3:23
[INFO] [stdout]   |
[INFO] [stdout] 3 | use ymlctx::context::{Context, CtxObj};
[INFO] [stdout]   |                       ^^^^^^^  ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `TaskErrorSource` and `TaskError`
[INFO] [stdout]  --> src/lang/python.rs:4:13
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::{TaskError, TaskErrorSource};
[INFO] [stdout]   |             ^^^^^^^^^  ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::io::Write`
[INFO] [stdout]  --> src/lang/python.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::io::Write; // for flushing stdio
[INFO] [stdout]   |     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/systems/mod.rs:10:24
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn start<I>(&self, Context, I) -> Result<String, TaskError>
[INFO] [stdout]    |                        ^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: Context`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` (part of `#[warn(rust_2018_compatibility)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/systems/mod.rs:10:33
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn start<I>(&self, Context, I) -> Result<String, TaskError>
[INFO] [stdout]    |                                 ^ help: try naming the parameter or explicitly ignoring it: `_: I`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]    --> src/builtins.rs:277:5
[INFO] [stdout]     |
[INFO] [stdout] 276 |     unimplemented!();
[INFO] [stdout]     |     ---------------- any code following this expression is unreachable
[INFO] [stdout] 277 |     let nproc = pool.len();
[INFO] [stdout]     |     ^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> tests/ci.rs:14:17
[INFO] [stdout]    |
[INFO] [stdout] 14 |             let mut metadata = std::fs::metadata(tmpdir.path().to_str().unwrap())
[INFO] [stdout]    |                 ----^^^^^^^^
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::trim_right`: superseded by `trim_end`
[INFO] [stdout]   --> src/systems/docker.rs:38:33
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let newline_len = id_stdout.trim_right().len();
[INFO] [stdout]    |                                 ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] help: replace the use of the deprecated method
[INFO] [stdout]    |
[INFO] [stdout] 38 -     let newline_len = id_stdout.trim_right().len();
[INFO] [stdout] 38 +     let newline_len = id_stdout.trim_end().len();
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `nproc`
[INFO] [stdout]    --> src/builtins.rs:277:9
[INFO] [stdout]     |
[INFO] [stdout] 277 |     let nproc = pool.len();
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_nproc`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `grid`
[INFO] [stdout]    --> src/builtins.rs:275:14
[INFO] [stdout]     |
[INFO] [stdout] 275 | fn fork_pool(grid: Vec<Context>, pool: &Vec<CtxObj>) -> TransientContext {
[INFO] [stdout]     |              ^^^^ help: if this is intentional, prefix it with an underscore: `_grid`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `pool`
[INFO] [stdout]    --> src/builtins.rs:275:34
[INFO] [stdout]     |
[INFO] [stdout] 275 | fn fork_pool(grid: Vec<Context>, pool: &Vec<CtxObj>) -> TransientContext {
[INFO] [stdout]     |                                  ^^^^ help: if this is intentional, prefix it with an underscore: `_pool`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 4.53s
[INFO] running `Command { std: "docker" "inspect" "607a5ed3016ce54f5e08ae1172386649300239a0303f010ef1c4d3f6aa017fe5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "607a5ed3016ce54f5e08ae1172386649300239a0303f010ef1c4d3f6aa017fe5", kill_on_drop: false }`
[INFO] [stdout] 607a5ed3016ce54f5e08ae1172386649300239a0303f010ef1c4d3f6aa017fe5
